48
Getinstantquote

Select Your Country/Region

English
Deutsch (German)
Español (Spanish)
Français (French)
Italiano (Italian)
Polski (Polish)
Русский (Russian)
日本語 (Japanese)
한국어 (Korean)
CNC Machining Service for Alloy steel 4140 | 1.7225 | EN19 | 42CrMo4

Ready to test your design? Upload your parts for free DFM analysis.

Get instant quote 0

  • Material type

    Metal

  • Material name

    Alloy steel 4140 | 1.7225 | EN19 | 42CrMo4

  • Alternative names

    42CrMo4, 1.7225

  • Process compatibility

    CNC machining
AISI 4140 is a low-alloy steel containing chromium and molybdenum, which guarantees it reasonable strength. Additionally, it demonstrates good resistance to atmospheric corrosion. Its superior properties have led to its widespread use across various industries.
Sunnyhowe
Mechanical properties
Ultimate tensile strength
355 - 370 MPa
Yield strength
230 MPa
Young's modulus (modulus of elasticity)
208 - 216 GPa
Elongation at break
18 - 26 %
Physical properties
Corrosion resistance
Moderate to Poor
Magnetism
Semi-Magnetic
UV resistance
Excellent
Weldability
Moderate
Thermal properties
Maximum service temperature
613 - 650 °C
Thermal expansion coefficent
11.5 - 13.5 10^-6/ºC
Thermal conductivity
42 - 48 W/(m⋅°C)
Electrical properties
Electrical resistivity
20 - 25 μΩ*cm
Post treatments
Post-Processing
Tempering & Annealing
Anodizing compatibility
Not suitable
Common applications
Heavy duty shafts
Connecting rods
High tensile bolts

Alloy Steel 4140 (1.7225 | 42CrMo4 | EN19) CNC Machining Applications & Parts

Alloy Steel 4140 is a versatile chromium-molybdenum medium carbon steel known for its high strength, good toughness, and excellent wear resistance. It is one of the most commonly used steels for general machining and can be heat treated to a wide range of hardness levels.

Typical Parts We Machine from Alloy Steel 4140:

  • General Engineering: Axles, shafts, gears, bolts, spindles
  • Hydraulic & Pneumatic: Cylinder barrels, piston rods, valve bodies
  • Tooling & Jigs: Milling machine arbors, fixtures, jigs, press tools

Our Machining Advantage:

We have extensive experience machining 4140 in all its conditions—from annealed to pre-hardened (~28-32 HRC)—using optimized parameters and tooling to ensure efficiency, precision, and excellent surface integrity.

Get an Instant Quotefor your custom Alloy Steel 4140 parts today.

Tagged: metal alloy steel
8 Strategies to Reduce CNC Machining Costs - Maintain High Quality
29 August 2024
8 Proven Strategies to Reduce CNC Machining Costs Without Sacrificing Quality

Discover 8 proven strategies to reduce CNC machining costs while maintaining quality. Learn about material optimization, design simplification, smart tolerancing, and selecting the right manufacturing partner for cost-effective production.

CNC Machining Design Guide - Tips for Optimal Results
29 August 2024
Mastering CNC Machining Design: Essential Tips for Optimal Results

Learn essential CNC machining design tips including material selection, DFM principles, tolerance optimization, and CAD best practices. This comprehensive guide helps engineers create cost-effective, high-quality machined parts through proper design techniques.

6061-T6 Aluminum CNC Machining - Applications & Optimization
29 August 2024
Application and Optimization of 6061-T6 Aluminum in CNC Machining Services

Explore 6061-T6 aluminum in CNC machining: key properties, heat sensitivity challenges, precision control solutions, and best practices for optimal results. Learn how to maximize this versatile material.

Heat Treatment Process for CNC Machined Parts - Improve Strength & Durability
29 August 2024
What is Heat Treatment and How Does It Improve CNC-Machined Parts?

Heat treatment strengthens CNC-machined parts by precisely heating/cooling metals to enhance hardness, durability, and stress resistance—critical for aerospace, automotive, and medical components. Improves machinability & extends part lifespan.

Ready to Get a Quote?

Ready to transform your CAD file into a custom part? Upload your design to get a free, precise quote.

Get instant quote
Friendly Links: Sunnyhowe CNC
ISO 9001:2015 | AS9100D | ISO 13485:2016 | IATF 16949:2016 | Certified Factory | Privacy Policy | Sitemap
Copyright 2025 © Sunnyhowe Co., Ltd. All rights reserved.
Trustpilot